121321323343220 has 576 divisors, whose sum is σ = 349613922470400. Its totient is φ = 34407673344000.

The previous prime is 121321323343163. The next prime is 121321323343247. The reversal of 121321323343220 is 22343323123121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5093456471 + ... + 5093480289.

It is an arithmetic number, because the mean of its divisors is an integer number (606968615400).

Almost surely, 2^{121321323343220} is an apocalyptic number.

121321323343220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121321323343220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174806961235200).

121321323343220 is an abundant number, since it is smaller than the sum of its proper divisors (228292599127180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121321323343220 is a wasteful number, since it uses less digits than its factorization.

121321323343220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24200 (or 24187 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 32.

Adding to 121321323343220 its reverse (22343323123121), we get a palindrome (143664646466341).

The spelling of 121321323343220 in words is "one hundred twenty-one trillion, three hundred twenty-one billion, three hundred twenty-three million, three hundred forty-three thousand, two hundred twenty".